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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities    
Net income $ 587 $ 209
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation 667 750
Share-based compensation expense 28 47
Loss on impairment 34 1,839
Loss on disposal of assets, net   20
Gain on retirement of debt (148) (7)
Deferred income tax expense (benefit) 11 (104)
Other, net 11 55
Changes in deferred revenues, net (30) (118)
Changes in deferred costs, net 66 142
Changes in operating assets and liabilities 52 (348)
Net cash provided by operating activities 1,278 2,485
Cash flows from investing activities    
Capital expenditures (1,072) (1,336)
Proceeds from disposal of assets, net 16 36
Proceeds from repayment of loans receivable   15
Net cash used in investing activities (1,056) (1,285)
Cash flows from financing activities    
Proceeds from issuance of debt, net of discounts and costs 1,210  
Repayments of debt (1,316) (1,306)
Deposit to cash account restricted for financing activities (24)  
Proceeds from cash accounts and investments restricted for financing activities 124 110
Distributions of qualifying additional paid-in capital   (381)
Distribution to holders of noncontrolling interest (23) (21)
Other, net 2 (3)
Net cash used in financing activities (27) (1,601)
Net increase (decrease) in cash and cash equivalents 195 (401)
Cash and cash equivalents at beginning of period 2,339 2,635
Cash and cash equivalents at end of period $ 2,534 $ 2,234